Guy is giving less… is it ok?

Hi. I’m (28F) talking to a guy (29M) for a month now and even though things seem to be going just fine, I think he takes me a bit for granted already.

We started talking shortly before his work delegation that is gonna last 3 months. At first he was finding more time during work to talk to me. Like multiple times a day to reply to a few messages. Right now we only exchange short messages in the morning and then we r talk for an hour before bed. (Time zones are different.)

He’s nice, he’s complimenting me and all, but I’m worried that:

- it is me who usually send the morning text first (even tho he starts morning earlier),

- I am sending him more pics and selfies,

- recently I told him about being stressed about work and he kind of ignored that message. (We were talking about multiple things at that moment and it was late for him, but… idk).

Am I panicking for no reason? Should I be concerned? Is there any way to test him? Or… should I try acting colder?